A man, arrested on the NSW mid north coast, is facing sex abuse and bestiality charges.

The alleged offences are alleged to have occurred at the dairy where the man and the teen, who was aged 13 to 15 at the time, were working.

Police will allege in court that the man befriended the boy and, over the course of the two years, indecently and sexually assaulted him.

Detectives will allege that the man also committed four acts of bestiality against the cows.

The man was arrested on Wednesday morning and charged with two counts of aggravated sexual assault and six counts of aggravated indecent assault.

He was also charged with four counts of committing an act of indecency towards a person under 16 years, five counts of inciting an act of indecency towards a person under 16 years and four counts of bestiality.

Following his arrest, police raided the man's home, seizing a computer and other electronic items, which are now being forensically examined.

He was granted conditional bail and will appear in court on February 10.